摘要
文中选取土工布、双向土工格栅和三向土工格栅,采用无侧限抗压试验方法完成了这三种筋材对级配碎石加筋效果的对比分析.结果表明:双向土工格栅的加筋效果最好.对双向土工格栅加筋级配碎石完成了一系列无侧限抗压试验和CBR试验,研究了压实度、加筋层间距对加筋级配碎石强度特性的影响,结果表明:①当压实度在90%~98%范围内时,双向土工格栅加筋级配碎石的无侧限抗压强度随压实度的提高而近似呈线性增长;②双向土工格栅加筋的级配碎石,其无侧限抗压曲线为应变硬化型,与纯级配碎石相比,不仅抗压强度显著提高,而且能承受很大的压缩应变,具有良好的韧性;③为了体现筋材的加筋作用,双向土工格栅加筋级配碎石宜采用10 mm贯入量的承载比作为CBR值.
Geotextile, bidirectional geogrid and three-dimensional geogrid were selected, and the unconfined compression test method was used to complete the comparative analysis of the reinforcement effect of these three kinds of reinforcement materials on graded-crushed stone. The results show that the reinforcement effect of bidirectional geogrid is the best. Then, a series of unconfined compressive tests and CBR tests were carried out on the graded macadam reinforced by bidirectional geogrid, and the effects of compaction degree and spacing between reinforced layers on the strength characteristics of the graded macadam were studied. The results show that:(1) When the degree of compaction is in the range of 90%~98%, the unconfined compressive strength of graded macadam reinforced by bidirectional geogrid increases linearly with the increase of degree of compaction.(2) The unconfined compression curve of graded macadam reinforced by bidirectional geogrid is strain hardening type. Compared with pure graded crushed stone, not only the compressive strength is significantly improved, but also it can bear great compressive strain and has good toughness.(3) In order to reflect the reinforcement effect of reinforcement materials, the bearing ratio of 10 mm penetration should be adopted as CBR value for graded gravel reinforced by bidirectional geogrid.
作者
胡幼常
邓立学
HU Youchang;DEN Lixue(School of Transportation,Wuhan University of Technology,Wuhan 430063,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2020年第6期962-967,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
